Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income	$ 11,741	$ 8,809
Available-for-sale investment securities:
Gross unrealized holding (loss) gain arising in the period	(10,113)	3,412
Related tax benefit (expense)	2,124	(1,194)
Less: reclassification adjustment for net gain included in net income	1	340
Related tax expense	0	(119)
Amounts reclassified out of accumulated other comprehensive loss per ASU 2016-01 (a)	(5,020)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Investment Transferred from Available-for-sale to Equity Method, Tax	1,054
Net effect on other comprehensive (loss) income	(11,956)	1,997
Defined benefit plans:
Net gain arising during the period	0	1
Amortization of unrecognized loss and service cost on benefit plans	26	23
Related tax expense	(6)	(8)
Net effect on other comprehensive income	20	16
Cash flow hedges:
Net gain (loss) arising during the period	1,378	(103)
Related tax (expense) benefit	(289)	36
Net effect on other comprehensive income (loss)	1,089	(67)
Total other comprehensive (loss) income, net of tax expense	(10,847)	1,946
Total comprehensive income	$ 894	$ 10,755